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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c761eb8310f930867e534dd02d99415bfc083f1df8b80c55f2420c2208cd8ef7' 
  AND token = 'HhSRyA22YEpXM1k3iXrQaXBhpIzv7OKYu9cR2SehN8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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