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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff8e89d618c9c3c3fe6a2b0fe8b2cafa60391f4eb7051a2bccd643ec3c8788' 
  AND token = 'BA3faMDAIWGPi2q5X7E1+/BA/GM5IpApTWQzGQeFQ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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