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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ed999c45c0d540556fd5d1eaec5e4acbd2ffe22f520ccb384761ae59e0f346' 
  AND token = 'YhsGAv18Eb0x+ziI4hXtlbUqrvDoiSRTV8/IeIMt88g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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