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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e907ba2e16570aeed535b80170af665e1d7b61eaa929009212e920a69e612a5' 
  AND token = 'RBi9sFrED2V/Y8Ox7jTHHDVF2taMonjcSmDJx38e7Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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