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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f20b79c5f1367773e8efc691d1072bfc8114c43e1aefff22d23d676810d8d0' 
  AND token = 'z9SrS84PovIitEN3/QrJgzIKcACuAKk9WqmPG0zuxp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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