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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09c7199e584ad4133a33f22a40c4a080661065d2e0bcb11fef9e5a74232fbab' 
  AND token = '1rBlpexcIE8cjKCTOC6f51De+yiETuyzaHKqyGZhvpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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