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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f57b99d82854b9f4d00b5b8bd1872a46d61ef0b86dce4d4d189dfbf88157ca' 
  AND token = 'TR0TbzQImQ1YZsxttBIhpyLEM7q82OHaFqw2kEPNueU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}