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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfa3360276ac3c3020bf72f37b356422c85bd43dc52141f0c29f67f5f9e98ad' 
  AND token = '755X+3gM8KmQ2YdocGFo0NTIgOVzjtHX2JLrGLUe2cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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