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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfb262e7f929ac012e40cca32516ac1df58e3154774928ce9a675d2a4da2475' 
  AND token = '5YhU4Tv8qpwacmYG5MVp+AY2VKov3t0C+zvR2K4YAVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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