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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fafad2072ee57fbccd362e662bf8aa87692496461948bb75dda642930586324' 
  AND token = 'Y4ft6ynnS4dT7Pu3j1zOv4fTX4ic2tc3TF/e5RAOs1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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