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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50313d4b2b83c52ed615b7ffac9aee7eeec9f2cad24bd2c7acf807dd83f52e21' 
  AND token = 'HuLXMcHb42u7At0sKL4cBxPPUgEWEP4VSULNTOlf+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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