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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac9c9d0817fb9a8a8cca54983d02d034d7c5aa56fa5f99fdc66fa0285f66ba4' 
  AND token = 'Qu07L/hTL4+UbwjFrwbONGlV3lmmj+2BL4zWtiEOs38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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