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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f941acf87767ddcb9329cf708c5ec15f5a24125a0061cbd4d2905c316f85053c' 
  AND token = 'zqM//n2Lh6xheXW1gUcpUg/Go00IczQfL+9PfDPRaxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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