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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99ab298ee5c918586a9813eff9fd133dc0ac4ba39cfe4ae848582f46c032ba3' 
  AND token = '7jjCjS6IiQcGH1Sq0QYE2ap/ipPPB4PfLf4eDvicvmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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