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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409f9a64450663b264df232e02b64ec293a001549e8dcebb650bbbe3e947b629' 
  AND token = 'CsPNcvLRErRJ8t0LZ38SpAP4Hz0zJ4EHXlH9bPslRZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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