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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6a480fdd4c3cdef1f867696e0de1e9c91c414a7e3318a0aec186260d3b08e8' 
  AND token = 'm3TZaJhJY16GWQY1AhzNUrzdA9/fCqqIDuAs+MDNuOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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