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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944d2c320f19d981ea1c06d14b55444662144f50bb7f2cee66b28b0ce2156b01' 
  AND token = '/MKtTDkgOwl2/SBHO/g1o6JYIu7l6Dh/S507jDdPUAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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