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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc9f09256f33c0defd2c6ed2dddd375a8699173d7a809609caf1480e2b9df8e' 
  AND token = 'b80vn75E8pSDstqq8epAOxm7IRBv35sdsP9nqyK3r7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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