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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1902c15b9a1182b2a35f2b21f7fc6f901a0d3a6636221c5e11341b10d85f3978' 
  AND token = 'UyG+0BUSJnWKu2iqZwwhX6TpfXskFHbXHd3y2wQrW8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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