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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2523da50ba88df1d9916cfdab747042671b7763347937e2341b3a8067d3cf1ed' 
  AND token = 'PQOkAKd85RN+0wO/Z9XuLHAPIi4xD8HJkOc2gUdxPyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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