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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd2b2fbf3c3c409c40f9a5c37b0e3e970811288ecb7c9e851b5cb2d8603e9a3' 
  AND token = 'yPregeul3BwAJjBwAt63VCNgUcGm8h+o2lEctOiR9HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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