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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9371b4e3b39e765c14fd2a7e20eee3140b4ebdc6c8911e83c154df057e300667' 
  AND token = 'zX6Yy9ui5idotEQ8orFkXitw9hdNPq404yNxr8griBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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