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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877a2c82389811261962dae76945f2b9a756da424f9c162424b16ef6aed47d11' 
  AND token = 'mNBwVPXXP3TIAZTqm53D7dD/+1ObNwPYsQfXk2P60Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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