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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560d01469b83beadc4852c0304aaebd160aa862b641edefe91b3fdf75aa7ab21' 
  AND token = 'zSwFRbrCbR0yJKTnSN1VPxtmgmMdv2PwBjN5A/wTHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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