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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984a4af417260cca722cd2b7c538289ab37dd45f7bacfb1559472b5eb86664f5' 
  AND token = '4d1D+2LaxnKw15rv6iMNptf1gf3pA5KMCMO6p5BF8aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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