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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55158a3e383de5e330d0b9320db90151753db13203ac933c3ecff7f0705ac17' 
  AND token = 'MLw/aGsXf8zeF4vvz5CJFh8TWQFfP6GGA/dPclHm4Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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