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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96f087674db5fbd34993cf47b3e1431e20b862a212ebaf8a897f24232daf3cf' 
  AND token = 'HAbcsT0BDJ02A+D2b/MKghcF4RxDPkCNRwRed2393Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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