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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd703911c6c39ab062ed817239236d05722e91cbd697cbc9835554b7410b6b5c0' 
  AND token = '4tR5PB8NfDty9qaWQejtaRNa3Vk9Mm2XRqRQi/tIQ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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