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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820e44e042f62ef6c41c328489f34707388233c87bc651f20b3bc36f7702f87f' 
  AND token = 'TEfGuJsSUpJzw2Jv+5KyGaVGBSqSs1uNsvUXWk2E1/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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