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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c35a61b2ac20ec61f9132a4c9c014a39b337a3d913910b0af26a8313964d53' 
  AND token = 'Mi6GVqPyzLJLKgc2MD302x0fZHdfXwukY1VEoaPLdNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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