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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6705f29eb0868ffb0089c95aa994fd04703d50f0be7a73deff19d98d6454ad' 
  AND token = 's+uLhL1yscrgP6EsrrQaSdK9K4Szgqdi2l72BLoujjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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