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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea701b928df797bb9d1094481d07b3b0202d172b29d6490ca7509076e5b4e85' 
  AND token = '3YPCid0jPRySt9jUkBqsTRTkYxS5V3DNoHryPzIo/MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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