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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eff40acb7d6a149be93c6570b70fb2a060399fdd38ad1330afb0a7540b8071d' 
  AND token = 'kCDLpcnUMkJ5M73s/POTJ5spe2YIef40W/hz3m6v1w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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