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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d96e6ba01f4dd668a951c6998d7dd815fa1100f972deef0dd754255f33061bd' 
  AND token = 'K5NcXZZUKIi6Zgmu2mVuEZjaWuU16IyFgTEvx707kro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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