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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bbdf25d5882f10d274cfcdfb50db68de3155b3b7be89c20ae5aa5333835d8b' 
  AND token = 'F7JblMryLvoMA4HDRmTXSRkMxRNPX14youj0/sYU0KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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