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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3109cc1df3ee21f59b15907beede9023fc34ef914bb398154c937238e8655cc' 
  AND token = 'qr8JWpuoFZd/QhZ4HT62gsEbSoBFRaw8TynkkiVL8R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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