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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ac5fb4ab4030896c54e8559c2e8b5e96544d49eda782ff9fc3c17706f9a754' 
  AND token = '9y3cDKBzP3qLdVLewa7XOSDC56n2BZeYRs9J/ZbIrcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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