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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f0c2518f29de97b3cf03a42d545c0518d4ab65adbee2d1c76def96a239f970' 
  AND token = 'AGCgMKDUqQxZ39A9FWpd+zTis0GG3pz5DNWa3js9/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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