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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93ed6e4a0f71d08be8ccea1058d5484faa5cc13580d4e4fa88343ab227407c1' 
  AND token = 'NrB26LT5jiYVAwcYPv/XvRLiAs1rwBpfwdBs8IsrP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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