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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ff1ffb416a0949af266771f6b31b9deed2ae9ebf6553e948fbb2be4c77c951' 
  AND token = 'DcCrzdm2/grUqfMzrNXpWI1N5WeltBRyXLEScy0Egs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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