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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9535359240ce0e4a5d0117018b814c6aa9db89484493c2ed1e3ebe75f802276' 
  AND token = 'p+FYaYvUVWGdGoddK4X5jIr/XD8yPVJJZ7Vkm/dESW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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