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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd777c854d247ea10e7ad7de2734fae28611393ca14a5f8b367f4e368ad9796ea' 
  AND token = '2grdiwj7dv4hM3+OpLbGBEqceLTG9DILz4ThLobiWqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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