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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf420e76b5c73057d978c337417d244f9ae09ef839ac7b43a7c43fefb287946a' 
  AND token = 'PnTCbuY0NZuFSQsiygOIr5FC7LNTl82aHml7eN3R4Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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