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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bb02a6313a75d0ed92da8c29193f12d8b4e9cc18a9460f745d500ad1ad43cb' 
  AND token = '+KP7nl+YECXO09uCa1JS67P3iXY+B7Y0YsR5CR4kQMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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