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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59682011883dff15f1cd6db1a5f9af26b605015b206cc0d21248c32b9f9b1749' 
  AND token = 'QwPaTyg5NrV+o9vJfoXBxAPnCeFnMu+vxzL3eBHkWXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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