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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69debb94ff40e57d7aa5f9c267d2f6852d0fa0fba5e2dfc1f15f1e5a0a7ef77' 
  AND token = 'rRpZnsnGFz1735WK7qTb28ufufYX5IWLAa804c6V2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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