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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa73ac48929ea4a6b6a3adda21ba7e0775f51a17736dafd1c830eca3a0c1d1e' 
  AND token = 'T6inF0L8QNZMdecL277vRR9/8qYIqG3Z5J4A+KgCZH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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