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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7169c6e1f6fe81d684533f86cbc3c86564c1ac81d9ff376ca4b4da62c0b30b' 
  AND token = 'zP0oHNOc3HrsMeVudLl063x4b1fKGpA4be70mzHWLjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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