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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5c4e28ba1b2f543b5c90aef59fd1585e5761babc8771aa13075b655cd746d3' 
  AND token = 'pjzzBx9eFeRGz2e8m2XYbF8uEUmOTPIcqN8lnl649J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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