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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12ec8e1a5aa49523b8e44edd5b89d23311ec6efe06a2172061cddb9ce449787' 
  AND token = 'BJcrQT2DLd/7hj0Kdh9Ma7HyP8cy+JxpdMUvdMscogs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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