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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea94b037e5a8bdd88e73c13452f49c8f223ec486a67c8ca0c081eab94f5db19' 
  AND token = '5/pvSUj8SjCVVxxvV8ro92SHrZf8Xelut566ayL0GAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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