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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b56eff45624b4959e804c47a33a41ed05755fe28107a58c0c51fc3e4cbe5450' 
  AND token = 'p4mnRJs70AG0vv+HaaorK/Tuy/pKdQh2EwX8AJJuzJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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