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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7557516cfd10de35da40b8e12c84b1b98a71a2aff8b4860fb9f4ea7a0bcd86' 
  AND token = '2oS0DT+8BCQ/hW3swHftF9lFsdDNWKfRFFHimW7myrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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