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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fded02e69fea3e2264643bd4212cd67f41b2a57a49e9cca201385c312200c13' 
  AND token = 'CTOEAlZXsSb2noEvrkVg9LGxI6eeRWTqY5/IBM5sQyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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