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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af48cf3f3c66d26bf80f11a2760a516aa3efcb7e5ceb7147cc8e7b4ddc6df61' 
  AND token = 'cHzPw5hsLliLjvv+z30ar+Whob3BeN4SC06RTyA13KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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