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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae75ced8bc5184aacf275500529a91d74552cfd49de2f0955d8e84474ed6cbee' 
  AND token = 'jN4jyWDD26pYAsOEqLbwkYYheaj8asbo6+5k7O7wS38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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