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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b38507a3d1ec3fb3acdbe0e98978de15cbf9db7b622e3e43811244e4c331f9' 
  AND token = 'LgDwQhhx01RvY5oT0MUEEbZm64uu/ix3dOVB/FyZ2WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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