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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82f8281814d9622b08a0ddf3203e0031aae10976cbbcd88fef932166c613a6d' 
  AND token = 'SN8c6HgOEoMfFfdZd36ZKeqWUREt8SKADLtYipGDKNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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