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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9948b1756e7b3a2839993aa4e08b82900b7a8391514c7a5e880d4c8176c4250d' 
  AND token = 'EmHtCNDbC9A0EZoTl1WCW4GMX2dnfuXRtZeq7qv9RWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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