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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2496177b4745e0dad6f7b040eb4632430c20585ff49043ddb6f2e44fb8165e9' 
  AND token = '6V64MGvZC4NxYkl3KlccZw02ZQEyd2IoDvsiq9gxJa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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