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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de80a547363da250977cd6e2222a5d15da2d4e1738c60e6a40e1bed86a24ff8a' 
  AND token = 'W3WZLdcQdolfePIdgi/Ox8a4h/MoUzeJ6uyXtvN6UhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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