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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbadb112ae5ec83cdb38b8727552d3180fdd7dc8e6f3f675405a5d40d9149652' 
  AND token = 'b+wfNBkPFt69IDTQjQIbAt1/eahoGOxeymt2uh2rfho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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