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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2c59debd95196de69bd64b0c2f061835f5371781a8493a3b230fca773f3fa2' 
  AND token = 'Ejg8hO+VUVzHelC5VI0A8mfP1Sbr6NfP7GfV7dN8dhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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