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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1dfcb1e1ec368a6cca9b52ffdcda2dea526f6a0ca58b0c338bc6e3e1384f6d' 
  AND token = '3GGXwe96zkwkwFfMbV57cdWPpRG0R2dknLa0ghdVWGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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